[sdotsen]

Reinventing the wheel. So many hours wasted on creating something that already existed in the form of PHP libraries or Python libraries that are written by much smarter folks. I tell my guys now, tools such as Ansible exist, don't try to write a whole Bash program to mimic what Ansible can do.

[clncy]

Counter to that though, re-inventing the wheel is a great learning exercise.

[dlhavema]

As a learning exercise yes, no need to "learn" with new production code :)